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In the crystal structure of the title mol­ecular salt, C6H9N2O2S+·H2PO4 −, the sulfomylalinium cations and the di­hydrogen phosphate anions form independent [100] chains through Ns—H⋯O (s = sulfamo­yl) and O—H⋯O hydrogen bonds, respectively. The chains are cross-linked by Na—H⋯O (a = amine) hydrogen bonds, generating (010) sheets. Two C—H⋯O hydrogen bonds involving diametrically opposite C atoms in the benzene ring of the cation as donors form chains parallel to [202] in which P=O and P—OH groups are acceptors. Together, these inter­actions lead to a three-dimensional network.

In the title compound, C26H20N4O2S, the thiazole and pyrrolidine rings adopt envelope conformations with the respective flap atoms being the N atom and the nitro-bearing C atom. The phenyl and indenoquinoxaline planes are oriented at an angle of 66.72 (1)° to each other. The molecular structure features two intramolecular interactions,viz. C—H...N and C—H...O. In the crystal, the molecules are connected through C—H...N and C—H...O interactions, forming ring motifs [twoR21(7),R22(14),R22(22) andR22(16)]. These ring motifs are connected through aC(9) motif chain.

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